feat: Improve error handling while communicating with Marketplace

[Gustrb]

Proposed changes (including videos or screenshots)

Introduce a new MarketplaceErrorHandler class that is going to be responsible for parsing marketplace-api errors and return the according error message strings from it.

Issue(s)

Steps to test or reproduce

Since we depend on having marketplace throwing errors to test this feature, I created a simple application that works as a proxy for marketplace, you can check it over here: https://github.com/Gustrb/api-stubber
It is pretty simple, and to run Rocket.Chat pointing at it instead of the actual marketplace one can simply:

$ OVERWRITE_MARKETPLACE_URL=http://localhost:3001 yarn dsv

Note: This assumes you are running the proxy at port 3001, while the default is 3000, this is done since the Rocket.Chat default port is also 3000.

Then, to test specific errors, you can tweak the config.json file

Further comments

CONN-64

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.17%. Comparing base (a5b4584) to head (46234ac).
Report is 10 commits behind head on develop.

Additional details and impacted files

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